Synthesis,crystal structure,fluorescence, electrochemical property,and SOD-like activity of an unexpected nickel(II) complex with a quinazoline-type ligand

An unexpected mononuclear Ni(II) complex, Ni(L²)₂]·CH₃OH (HL² = 1-(2-{(E)-3,5-dichloro-2-hydroxybenzylidene]amino}phenyl)ethanone oxime), has been synthesized via complexation of Ni(II) acetate tetrahydrate with HL¹. HL¹ and its corresponding Ni(II) complex were characterized by IR, ¹H-NMR spectra, HRMS, as well as by elemental analysis, UV–vis, and emission spectroscopy. The crystal structure of the complex has been determined by single-crystal X-ray diffraction. Each complex links two other molecules into an infinite 1-D chain via intermolecular hydrogen bonds. Moreover, the electrochemical properties of the nickel complex were studied by cyclic voltammetry. Superoxide dismutase-like activities of HL¹ and Ni(II) complex were also investigated.